package com.fjc.utils;

import java.security.MessageDigest;

public class Md5 {
    public static String encryption(String key)throws Exception {
        char hexDigits[] = {
                '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
        };

        byte[] btInput = key.getBytes();
        // 获得MD5摘要算法的 MessageDigest 对象
        MessageDigest mdInst = MessageDigest.getInstance("MD5");
        // 使用指定的字节更新摘要
        mdInst.update(btInput);
        // 获得密文
        byte[] md = mdInst.digest();
        // 把密文转换成十六进制的字符串形式
        int j = md.length;
        char str[] = new char[j * 2];
        int k = 0;
        for (int i = 0; i < j; i++) {
            byte byte0 = md[i];
            str[k++] = hexDigits[byte0 >>> 4 & 0xf];
            str[k++] = hexDigits[byte0 & 0xf];
        }
        return new String(str);
    }

    public static void main(String[] args) throws Exception{
        System.out.println(encryption("1afeafaf8auf8afu8afh80afha80fna0f8awfawme0fnawfa8whfani1"));
        System.out.println(encryption("1afeafaf8auf8afu8afh80afha80fna0f8awfawme0fnawfa8whfani1").length());
    }
}
